uint8 EXTERNAL_LATERAL_NO_CMD = 0
uint8 EXTERNAL_LATERAL_KEEP_IN_LANE = 1
uint8 EXTERNAL_LATERAL_BYPASS_IN_LANE = 2
uint8 EXTERNAL_LATERAL_CHANGE_TO_LEFT = 3
uint8 EXTERNAL_LATERAL_CHANGE_TO_RIGHT = 4

uint8 EXTERNAL_SPEED_NO_CMD = 0
uint8 EXTERNAL_SPEED_FREE = 1
uint8 EXTERNAL_SPEED_FOLLOW = 2
uint8 EXTERNAL_SPEED_ESTOP = 3

Header header
int32 send_packet_id
int8 lateral_cmd
int8 speed_cmd
